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March 8, 1932. L. M. PERSONS DRAFT CONTROL MEANS Filed May 3, 1950 [72 We 72 0 7" [61247127206 (if. F67j5072 5 fltorne ,5,

Patented in. some, or er. mm, mssouar a r common MEANS Application med; May a, 1930. Serial No. 449,371.

My invention relates to combustion control means, for exaniple, for furnaces, and has for one object to provide thermostatically responsive control means for a furnace. One

object of my invention is to provide control means for the air inlet and for the check draft of a furnace. Another object is a provision of control means which shall be simple to install and eficient in operation. Other objects will appear from time to time in the course of the specification and claim.

I illustrated my invention more or less diagrammatically in the accompanying drawings, wherein Figure 1 is a section of a building with parts in elevation. Fi re 2 is a section on the line 22 of Figure 1, and

Figgre 3 is a section on the line 3-3 of Figure Like parts are indicated by like symbols throu bout the specification and drawings.

Re erring to the drawings, A generally indicates any suitable furnace which may have, for example, the fuel inlet door A and the usual air inlet A A indicates the flue or outlet for the exhaust products of combustion. A* indicates air outlets for the air heated by the furnace. It will be understood that I do not limit myself to the employment of my invention with a furnace associated with a hot air heating system, and its application thereto, as shown in the accompanying drawings, is merely illustrative.

B indicates diagrammatically a thermostat adapted to. respond to house temperatures. This thermostat is included in a circuit which includes the conductive line B extending from one "end of the secondary coil B of the transformer. B extends from the opposite end of said coil. B indicates the primary coil 40 of the said transformer, and B the energizing circuit for said primary coil which may, for example, be energized by a commercial electric power. In order to conform to underwriters requirements, the current may be ste ped down to, say, 25 volts.

cluded in the circuit B B are a plurality of resistance coils 0. Each such coil may be wound about any insulating and refractory member C, as illustrated, although I do not wish to limit myself speclfically to any particular type of resistance. The important fact is that I provide electrically operated heating or motor means in a circuit controlled by the temperature control room thermostat.

Each such resistance has adjacent it a bimetallic strip C indicated as coiled, as shown in Figure 3. One end of each such strip is secured as at C and the rest of the strip is free to flex, with the limitation that the opposite end is secured, as at C, to any suitable rotatno able member or pin C The pin 0 has a fixed position or axis of rotation and may be provided, for example, with the bearing C" associated with a housing 0 to house the sim ple heat motor above described. It will be 5 understood that when the actuating circuit is closed as by the operation of the thermostat, the coil C is heated by the passage of current therethrough, and causes the bi-metallic strip .0 to flex.- The flexure'of said strip rotates 7c the pin C and with it the butterfly valve C mounted thereupon. One of said valves may be positioned within the air inlet A and the other within the check inlet A in communication with the exhaust outlet or flue A. The" parts are so disposed that when the thermostat calls for heat the-valve in the check inlet A is closed and the valve in the air inlet A is opened. Corresponding, when the thermostat calls for a cessation or reduction of heat so the change in the temperature to which the heat motors are subjected reverses the previous action, and closes the valve controlling the air inlet A while opening the valve controlling the check passage A It will be realized that whereas I have described and shown a practical and operative exemplification of my invention, nevertheless I do not wish to be limited precisely or specifically thereto. In a broad sense I wish 90 my drawings and description to be taken as illustrative, rather than as limiting me to the precise details shown, except so far as limit myselfby my claim.

I claim In a control means for avalve, a valve member including a valve stem, a' casin having an aperture therein in which one end of the valve stem is j ournaled, a coil thermostat in the casing having one end secured to 109 the side thereof and having its other end 7 attached to said valve stem, a core in said casing extending across and supported by the side walls of the casing and spaced below the thermostat, -a'resistance element on "said,

core in circuit with thermal control means"- for flexing said thermostat, and means for su porting said casin I V j igned at St. Loms, 'Missouri5 this 2 9th day of April, 1930. I

LAURENCE M. PERSONS. 

